Binder-phase wolfram-carbide (WC) hard alloy and preparation method thereof

A cemented carbide and tungsten carbide technology, applied in the field of cemented carbide, can solve the problems of reduced cemented carbide properties, decreased alloy hardness, poor toughness, etc., to achieve excellent hardness and wear resistance, improve hardness and wear resistance, The effect of reducing the difference in coefficient of linear expansion

Active Publication Date: 2013-08-14
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the YG series cemented carbide, hardness and toughness are contradictory. The toughness of cemented carbide can be improved by increasing the content of Co in the binder phase. reduced sex,
[0004] On the other hand, YG series cemented carbide also has defects such as brittle and hard materials, poor toughness and high price, which make it difficult to be made into large-sized and complex-shaped components for application.
In actual use, the welding of cemented carbide and steel body is the main method to make up for its shortcomings, but it is difficult to avoid high temperature heating in the brazing process, and even heat treatment after welding
These high-temperature treatments are easy to generate a large internal stress for the hard phase WC and the binder phase Co, which have a relatively large difference in linear expansion coefficient, resulting in microcracks and reducing the performance of the cemented carbide in all aspects.

Method used

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  • Binder-phase wolfram-carbide (WC) hard alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] a) Firstly, the WC powder with a uniform particle size of 3-5 μm and the binder Fe with a particle size of 1-3 μm are screened in advance 3 Al powder is prepared according to the mass percentage of 85% and 15%, of which Fe 3 The composition of Al alloy is (accounting for Fe 3 Al alloy (mass percentage): Al17%; Cr5.2%; Nb2.0%; Zr0.3%; B0.1%; Ce0.5%; Fe75%. And add 1% stearic acid batching as additive, mix and grind 45 hours in ball mill;

[0032] b) The mixed and ground raw materials are vacuum-dried and sieved to remove aggregates, then granulated, and then mixed at 900kg / cm 2 Precise pressing under high pressure to make a green compact;

[0033] c) Place the finished compact in a vacuum of 4×10 -4 MPa vacuum sintering furnace heated to 1250 ° C vacuum sintering for 1 hour, followed by hot isostatic pressing at 1250 ° C and 100 MPa for 1 hour to make cemented carbide. Take it out after cooling to get the finished product.

Embodiment 2

[0035] a) First, pre-screened WC with a uniform particle size of 3-5 μm and binder Fe with a particle size of 1-3 μm 3 Al powder is prepared according to the mass fraction of 92% and 8%, of which Fe 3 The composition of Al alloy is (accounting for Fe 3 Al alloy (mass percentage): Al15.6%; Cr1.3%; Nb2.2%; Zr0.4%; B0.2%; Ce0.3%; Fe80%. And add 0.8% stearic acid batching as additive, mix and grind 48 hours in ball mill;

[0036] b) The mixed and ground raw materials are vacuum-dried and sieved to remove aggregates, then granulated, and then mixed at 1000kg / cm 2 Pressed under the pressure to make a green compact;

[0037] c) Place the finished compact in a vacuum of 4.5×10 -4 Heating to 1300°C for vacuum sintering in MPa vacuum sintering furnace for 1.5 hours, followed by hot isostatic pressing at 1300°C and 110MPa for 1.5 hours to make cemented carbide. Take it out after cooling to get the finished product.

Embodiment 3

[0039] a) First, pre-screened WC with a uniform particle size of 3-5 μm and binder Fe with a particle size of 1-3 μm 3 Al is prepared according to the mass fraction of 94.5% and 5.5%, of which Fe 3 The composition of Al alloy is (accounting for Fe 3Al alloy (mass percentage): Al14%; Cr6%; Nb2.4%; Zr0.5%; B0.3%; Ce0.2%; Fe76.6%. And add 0.5% additive stearic acid batching, mix and grind in ball mill for 50 hours;

[0040] b) The mixed and ground raw materials are vacuum-dried, sieved to remove aggregates, and then granulated. 2 Pressed under the pressure to make a green compact;

[0041] c) Place the finished compact in a vacuum of 5×10 -4 MPa vacuum sintering furnace heated to 1350 ° C vacuum sintering for 2 hours, followed by hot isostatic pressing at 1350 ° C and 120 MPa for 2 hours to make cemented carbide. Take it out after cooling to get the finished product.

[0042] Properties of cemented carbide

[0043] .

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Abstract

The invention discloses binder-phase wolfram-carbide (WC) hard alloy and a preparation method thereof. The hard alloy comprises WC powder serving as a hard phase and Fe3Al alloy powder serving as a binder phase, wherein the particle diameter of the WC powder is 3-5 microns, and the Fe3Al alloy powder accounts for 5.5-15% of the hard alloy and has the particle diameter of 1-3 microns. The preparation method of the hard alloy comprises the steps of: firstly proportioning the WC and binder Fe3Al powder which is sieved and selected in advance and has a uniform particle size according to required mass percentage, adding additives, and mixing and grinding in a ball mill; then carrying out vacuum drying, sieving to remove aggregates, and then, granulating and pressing; and finally placing formed press blanks in a vacuum sintering furnace, and carrying out vacuum sintering and hot isostatic pressing treatment, thereby preparing the hard alloy.

Description

technical field [0001] The invention belongs to the field of cemented carbide for wear-resistant parts, and relates to a 3 Tungsten carbide cemented carbide with Al as the binder phase. Background technique [0002] Cemented carbide is a kind of cermet tool material prepared by powder metallurgy with refractory metal compounds (WC, TaC, TiC, NbC, etc.) as the matrix and transition metals (Co, Fe, Ni) as the binder phase. , has the advantages of high strength, high hardness, high elastic modulus, wear resistance, corrosion resistance, small thermal expansion coefficient and relatively stable chemical properties, and is widely used in cutting tools, wear-resistant parts, mining and road construction machinery and other fields . [0003] The binder phase of cemented carbide plays an important role in the overall properties of the alloy. At present, the common bonding phase of WC-based cemented carbide is mainly divided into Co bonding phase and non-Co bonding phase. Among th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05
Inventor 薛烽周健巨佳白晶孙扬善
Owner SOUTHEAST UNIV
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